Core construction for electrical apparatus.



E. c. GEORGE.

CORE CONSTRUCTION FOR ELECTRICAL APPARATUS.

APPLICATION FILED FEB. I9. 19H.

1,282,684. n rammed 0615.22, 1918.

UNITED STATES PATENT OFFICE.

EDGAR C. GEORGE, OF NOBWOOD, OHIO, ASSIGNORTO ALLIS-CHALMERS MANUFAC- TURING COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF DELAWARE.

trical apparatus, and has particular relation to means for promoting eiiicient ventilation of the cores of such'apparatus while maintaining amechanically strong and durable core construction.v`

The present inventiony is. of particular utility in a-'core construction of a type wherein sectionsof the core,.usually made vup of laminations, are spaced apart and heldin such spaced relation as to provide one or more passageways through which air is circulated in the operation of the apparatus to assist in maintaining the core and windings associatedltherewith inaJ cool operating condition, and-wherein the spacing means used are in the'form of'a plurality of separate spacing elements secured to one ofthe core sections,- asby welding to the end lamination of thesection, andbearingagainst the other core section.' `With a construction of this character, it may be possible that an ndividual one of the spacing elements may, because' of some imperfectioningthe union between the spacing device and the end lamination, become detached lfrom the lamination and dropout of operativeposition, or be thrown, in the case offa rotor core, into the' air-gap of the apparatus while the latter is in operation.

In accordance withthe vpresent invention, means are provided Afor locking a plurality of the individual spacing elements together and `in operative positionkrelative to the core sections which theyv serve to space apart, the general construction ,serving to prevent an individual spacing deviceV from being forced t out of operative positioin or, inthe' case of a dynamo-electric machine, from dropping or being thrown into theair-gap of the ma-4 chinefduring the operation thereof, should suchk spacingdevice become detached from the core section by reason of any imperfection in the attachment of the`r device .to `the core section. *These locking strips are. attached'to the coresection, either' directly or throughone or more of the spacing devices,

i Specification of Lettersratent.

CONSTRUCTION FOR ELECTRICAL APPARATUS.

Patented oet. 22,' 1918.

Application Ied February 19,v 1917i Serial No. 150,268.

tofbe dislodged from operative position un less all the spacing devices are so dislodged and thelocking strip itself is detached from the core section. The general construction is such as provides for the required mechanical strength and Ventilating space while fully insuring against damage due to accidental detachment of an individual spacing device, the desired results being secured with minimum weight of material and cost.

It is an object of this invention to pro vide improved means comprising a plurality of individual spacing elements for spacing the sections of electrical apparatus, which means may be readily and cheaply provided and assembled, and which provides for the required mechanical strengthfand the efiicient ventilation of the core while insuring the retention of the individual spacing elements in operative position. Y

It is a further and more specific object yof'tliis invention to provide improved means for spacing apart sections of the core of electrical apparatus, this means involving the use of a plurality of spacingelements in the general form of headed rivets, the heads of the rivetsbeing attached t0 one of the core sections, and a unitary device being provided for locking each of several of the. individual rivets against displacement should any of these rivets become detached from thecore section.

These and other objects are attained by this invention, the various novel features ofwhich will appear from the description and drawings, disclosing one embodiment of such invention, and will be particularly pointed out in the claims. v

f In the accompanying drawings:

Figure 1 is a radial sectional view through a portion of a core of a dynamo-electric machine embodying features ot'y this invention,

the section being taken along the line I-I of Fig. 2.5

Fig. 2 is a broken sectional view through the core of Fig. 1, showing the manner in which the' spacing devices'and the locking means therefor are arranged in position relative to the end lamination of a core section, the section being taken along the line II-II of Fig. 1. Fig. 3 is an yenlarged fragmentary secf of points synnnetrically Iarinnged about, orr along an annular surface radially outsidel tional view showing-the mannerA of securing eFl iif Si'derr @met Slipper# '11.; Ihel core is divided into'faplurality of spaced sections or groups of laminatioiis, theoppos-` ing' end laminationsfofj tivo adjacent core sections`v oifgroiips of laininat'ions being designatedasfzlQ and 1 3, respectively, and the space 'betwli siicli'groups `being desig` i. This space 14 between v'the coifelrsections or groups of laniina'tinsis*provided "duringthe assemblingof the `core on the spider 11,'

spacing device/S15 nbetiifeen the end -lziniina--' tions 12 and 13r serving to space the-,seetions the required distance apart aiidtoeifectively maintain 'y the'- sections infsiich spaced reltr tion..` As shown, these Vspewing dei-'ices 15.V

arein the formmof ordinary iron or sott]` tinners rivetsy comprising a shank portion `16y andan venlarged head -17' which is attached to the lamination 13 Wit-hthe shank portion rextendingtivxially fof* the in z'icliine'.. These rivets or spacing deyicesare attached to the lamination 13 preferably before the saine is assenjibled on the spider, the lirefer.- y able manner of attaching the same being by,

an 'autogenous union, as byy electricall-ywelding the ,head portion of the .,riy'et to the lamination; the AWeld or area of yattachment oic thefrivet being Aprefera'blyl at a plurality of, the shank portion of therivet, thisweld ed area rbeing generally indicated by 4the` `character 18'n Figs. 3 and 4. The preferrable method of attaching the rivets includes the usey of a hollow electrode, such as is shown at 21 inflig. 3, which may fit overv the slianlrportion of the rivet and a. second `electrode 23 adapted to' bear against the.; v l l y i the latte/ris. atfethed tothlemintleirlbe;

rear vside of the lamination 13K. v

Thile a proper ieldediinion of the de siredh strength is lifeadilyf attainable under normal. conditions, it is pfossiblethat there may I. heI A an iiiiperfjcct Lfniion betyeenrrone or' more 0,1 .the .inrete and. the 1am.met1911,y Hence, Where there are no vmeans tov prenfent;Y

it,I it, might, happen ,that a riiet 'Whicliihad accidentally beconiedetaolied from the Inlarcifdz 'wee this-V inveiition', ablock-.r

'nin' stri ii'oltombarativel lioli materialv i .Y c

3 showingn spacing' elements and "the"la`mi`na"tion' with which they are associated, as t0 prevent 4mei'@lisent ofanyione onmomiof such "space ing elementsshould the; samey .become detached from the lamination. This locking strip 25is `'prioridad with'openings 26 which receive the shank portions of a pliirality of 'alinedspaoing rivets. the body. ffnffof tliestrip abuttirig. z i` ainst the inner side. of the head y17 of V"ez'iclfo the rivets and being Vsecured thereto preferably .through an eleof` tric Weld whiclrina'yl scoured.. fsubstair della' the eameniannr tenis 'the Weld' be@ tween the fiveiaind esaminarewelded.r areal@ *the lotkinifeip 1.25 time@ head` of rit'et generjllylindicated b g While the safestfarra "inenfin'cldefsf under certain fcirciiinstaxces,` niabe secured meter intagli-the atecliiheii'qffiess q mimber f rvetfftethe lmnatlon or 'Whe i'ekin snap; l t, y In ig- 4 there is ,Shown a motlificiitienl of the locking strip 25 aii'dthe'mealnsfor si,

Iig the ,lbslpfl yt neverthelessi curingr the saine and the seyeral, spacing` rivets in Q'petatip Strip', here des'lsiie es Weinsteed a plainlatstrip', as inthe case of and 3', has yportionsbent the'plan (if Y.

niej-nner. fases -Q-fz the Heede.' Ot thelirivets andintengagment with the lamination 13,

ing- Pleifeiiby `ettaelie.d @t0 'the 13,as by. spot-{Weldingyas indicated .at all all this attachment servmg,.as an additionalhf,

means 'for retaining the. land eeehfof the Speel@ riiebsis the laminat 13. andtbellokingSitintlid only'. an portion of` 'ther rivets-1y ape f iii the lockingV strip inde secnrin r.the lockflig-Strip to the lamination- 4are assembled in position in thecore. 'where' the rivets are attached. to both the Vproxiinately the same Width as the head of 'la rrivet and may be mounted in o erative po- `sition relative tothe rivets an 'nation With which it is associated in the the lamimann'erdescribed above, or'in other Ways. Forinstance, the perforations in the locking strip may be slightly smaller than the yshank "portions of the rivets so'that when the latter are pressed intothe perfor-ations, they are held quite llirmly4 in position. Vith this latter arrangement, fthe rivets maybe held yin operative-position in the ,core in a satisfactory, 1nan1ier merely by attaching the locking striptothe end lamination or by attaching one or more ofthe rivets to the lamination, orfby both methods of attachment.y In any case, Where the rivets are to be attached to the locking strip, they may be so attached before the locking strip and rivets Again,

ment wherein several ofthe spacing devices are in` alineni'enas generally indicated.k in F1g`.-2,jis preferred vfor 'the reason that a comparatively simple form of locking strip maybe sults.` i', y

By using a locking strip of the character described and associated with the core laminations and spacingdevices attached there- Lto in` thcmanner described, an exceptionally used to., accomplish 4the desired resimple and cheap spacing means is provided .wherein the required mechanical strength is present and accidental detachment of one or more of the individual spacing elements has no serious consequences.

It should be understood that it is not desired that the invention claimed be limited to the exact details of construction shown and described, for obvious modifications will appear to a person skilled in the art.`

It is kclaimed and desired to secure byy Letters Patent: i

1. In a core for electrical apparatus, a lamination, a pluralityof separated spacing devices at least one of which is attached to said lamination, and a locking element for said spacing devices comprising a strip having perforations through which said spacing devices extend.

2. In a core for electrical apparatus, a lamination, a plurality ofspacin devices in contact with said lamination, an a locking element for said spacing devices comprising a strip having perforations through which said spacing devices extend, said locking element being fastened at one or, more points to said lamination.

3. In a core for electrical apparatus, a

lamination, a plurality of separated spacing .locking element for said spacing devices attached to said lamination and having perforations through which said spacing devices extend, said locking elementbeing'attached to certain of said spacing devices and preventing movement of a detached one of said spacing devices relativeto another of said spacing devices and said lamination.

5. In^ a core for electrical apparatus, a lamination, a plurality of spacing devices secured thereto, each of said spacing devices being in the form of a rivet having a shank `portlon and an enlarged head at one end of said shank portion, and a locking element associated with said spacing devices and held against movement relative to said lamination,` said locking element preventing movement of a detached one of said spacing devices relative to another of said spacing devices and said lamination. o n In a core forfelectrical apparatus, a lamination, a plurality Vof spacing devices secured thereto, each of said spacing devices beinggin the form of a rivethaving a shank portion and an enlarged head at one end of said shank portion, and -a locking element comprising a strip having perforations receiving the shank portions and attached to the heads of said spacing devices, said locking element preventing movement of a detached one of said spacing devices relative to the other spacing devices and said lamination.

7. In a core for electrical apparatus, a lamination, a plurality of spacing devices secured thereto, each ofsaid spacing devices being in the form of a rivet 'having a shank portion and an enlarged head at one end of said shank portion, and a locking element comprising a strip attached to said lamination and having perforations receiving the shank portion and attached to the heads of said spacing devices, the heads of said rivets being united to said locking element by fusion of metal of the parts, and said locking` element preventing movement of a detached one of said spacing devices relative to the other of saidspacing devices and said-Vlamination. l 1

l8. Ina core 'for electricalapparatus, a plurality of axially Vspaced and laminated sections, means for holding said sections in spaced relation, said means comprising a plurality of spacing elements, each of said spacing elements including a shank portion andan enlarged head bearing againsty and attached to an end lamination of one of said sections, and a locking element associated with one of said spacing devices and held against movement relative to said lamination, saidloclring element preventing movement of said spacing device relative to'said lamination.

9. In Va core for electrical apparatus, a lplurality of axially spaced sections or groups of laminations, means for holding said sections in spaced relation, said means 'comprising a' plurality of spacing elements, Veach of said spacing elements including a shank portion'andan enlarged headbearing lagainst and attached to an end lamination ofone'of said sections, and a locking element having perforations receiving kthe shank portions and attached tothe heads of said spacing devices, said `locking element `preventing movement of a detached one of said spacing 'devices relative to the other .of said spacing devices and said lamination. Y

10.1In acore for electrical apparatus, a plurality of axially spaced sections or groupsl of laininations, Vmeans forfholding 'said sections in spaced relation,` said means 'comprising a pluralityv of Vspacing elements, each of said spacing elements being in the 'form-of Va rivet having ashank portion and an enlarged head bearing against and attaehedtoan endlamination of oneofsaid sections; `and a -locking element comprising cap'iesorthis patent vmay be obtained Aa strip attached to said lamination andhaving perforations receivin lthe shank portions and attached tot e heads of `said rivets, lsaid lookin element .preventing movement of a detac ed one of sald spacing devices relative to the other of said spacing devicesand said lamination. 4

`11. In a core for electrical apparatus, a plurality of axially spaced laminated sections,rmeans for holdingV said sections in spaced relation and comprising a plurality of spacing elements, each of said .spacing` elements being in the form ofa rivetv having a shank portion andan enlarged head, said enlarged `head bearing against v'and Vbeing attached to an end laminationtjofone of said sections, and a klookin .element comprising a strip having per orations receiving said shank portions and attachedfto the 'heads of said rivets; the attachment ofsaid rivets to said locking stripand saidlaminationbeing through an autogenous union of the parts, and the points of attachment of the head of a rivet to said lamination and said locking element ybein in alineme'nt in -thedirection of the axiso lsaid rivet.

aplurality of rivets extendingthrouhthe perforations, said rivets having ya shan por tion and an enlarged head.

'In testimony whereof, the signature off the inventor is affixed hereto.

' QEDGAR CQGQBGE.

for inve cents eachf arlctress'hxg-Vthe @Commissioner -otfrntentn .Washingten,D.`G. 

